Homeostasis is maintained by negative feedback loops within the organism. In contrast, positive feedback loops push the organism further out of homeostasis, but may be necessary for life to occur. Homeostasis is controlled by the nervous and endocrine systems in mammals.
D. is correct: Koalas evolved after trout.
(A is false, B is also false bc amoeba are unicellular, C is false too, they are definitely not in the same class)
Antibiotics are ineffective in treating viral infections because Antibiotics kill only living cell. Antibiotics treat bacterial infections but not viral infections. Foe example, an antibiotic is an appropriate treatment for step throat, which is caused by the bacterium Streptococcus pyogenes. However, it is not the right treatment for most sore throats, which are caused by viruses.
The correct statement is this one: Molecules move from areas of high concentration to areas of low concentration.
This is true also for diffusion outside of organisms, for example diffusion of gases in a room.
The other options are false.
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